Fuse device.



E. 0. SCH WEITZER.

FUSE DEVICE.

APPLICATION FILED FEB. 20. 1914.

1,215,999. Patented Feb.13,1917.

EDMUND O. SGHWEI'IZ EB, OF CHICAGO, ILLINOIS.

FUSE DEVICE.

Specification of Letters Patent.

Application filed February 20, 1916. Serial No. 819,941.

My invention relates to fuse devices, andespecially to what aretechnically termed inolosed or cartridge fuses.

Prominent objects of the invention are to provide a simple, practicaland inexpensive type of fuse device; to simplify and cheapen theconstruction; to secure a high degree of efiiciency; to arrange for theready and automatic indication of thecondition of the fuse, whether itis operated or not; to arrange for easy and read refilling; and tosecure the foregoing an other desirable ends in a simple and expeditiousmanner.

In the accompanying drawings Figure 1 is an elevation of a fuseembodying my pres ent invention;

the device;

Fig. 2 is a longitudinal section of the same;

Figs. 3 and 4 are cross sections taken on lines 3-3 and 44 respectivelyin Fig. 1;

Fig. 5 is a view of an interior portion of Fig. 6 is a view similar toFig. 1 of a modified form; Fig. 7 is a view of an interior portion ofsaid device; and

Fig. 8 is a longitudinal section of an end view of the same.

Referring firstto the device shown in Figs. 1 to 4: inclusive, I show ahollow casing 1, which might be any one of a variety of shapes, butwhich is preferably tubular. This casing 1, is preferably of insulatingmaterial, such for example as fiber. Within the hollow member 1 isanother hollow mem- -ber 2, preferably of the same sha e as the member1, and of a size to fit snug y within the same, so as in effect to forma lining therefor. This member 2 is preferably of fireproof-material,such for example as asbestos. Inside of. the member or lining 2 is afuse member 3 which is also preferably hollow and of a shape and size to'fit' closely within the-member 2. The fuse member 3 is shown separatelyin Fig. 5. As shown in this figure the end portions of said fuse 3 arefringed or slit as at 4, and when the fuse is arranged within the hollowor tubular casings said fringed or slit portions 4 are turned or bentback so that they come on the outer side of the end ortions of themember 1. Metal caps or ferrules 5 and 6 are fitted over the ends of themember 1, thereby closing the open ends of said member and also makingcontact with the turned back ends 4-4 of the fuse 3. The cap or ferrule5 is preferably provided with an annular indented portion 7 adapted tofit in a similar groove in the outside of the casing 1 so that saidferrule shall have a reasonably tight snap fit. The other cap or81111563 preferably provided with lugs 7 (Fig. 1), through which screws8 are-extended to secure said ferrule 6 detachably to the casing 1. Thecaps or ferrules 5 and 6 are preferably provided with contact endportions 5 and 6.

The casing 1 and lining 2 are preferably provided with an elon ated slot9, through which the fuse 3 may be seen. In this way it may be toldsimply by lookin through the slot 9 whether or not the fuse as blown,thus forming a very simple and satisfactory indicator arrangement.

The fuse 3 is preferably provided with apertures or recesses '10 .(Fig.2) which form a weakened part to the fuse, so that it will blow at suchpart, preferably the middle of the fuse.

The modified arrangement shown in Figs. 6, 7 and 8 has the casing 1provided with cut-away portions or recesses 12-12 serving as vents. Inthis arrangement the fuse also is preferably provided with cut-awayportions as 1010. In this arran ement also I preferably make the hollowuse 3 longitudinally split as shown in Fig. 7, so that said fuse may beconveniently formed from a flat sheet of material formed into properhollow or curved form, as for example by 100 rolling it into cylindricalform in case the fuse is a cylindrical tube.

In this modification also as best shown in Fig. 8 I preferably provide ametal collar 15 arranged outside of the end portion of 105 the casing 1,which collar lies under or within the fringed portion 4 of the fuse 3where by metal hearing or contact surfaces are provided on both sides ofthe ends of said use.

Patented Feb. 13, 1917.

The interior of the fuse 3 is preferably filled with non-combustible andnon-conducting granular filling material 16. This of course being on theinside of the fuse does not prevent the indicating arrangement of thefuse from acting satisfactorily.

The device can also be refilled, as Wlll be obvious. It has thisadvantage however, that the fusible'elements cannot be interchangeablein the various sizes of fuse devices. This is so arranged because therefilling is usually done by inexperienced people. Attention istherefore called to the fact that in the fuse'device disclosed hereinthe size or diameter of the fuse is such that no smaller or larger fuseelement than the right size can be inserted in the fiber casing or tube.Furthermore, the thickness of the fuse element cannot be changed becausethe outer casing or tube and ferrule have definite sizes; and the lengthand width are perfectly definite for each size of casing or tube. So faras I am aware this advantage is not secured by any fuse now on themarket, regardless of whether it is of, the refillable type or not.

Furthermore, the fuse, in conjunction with the filling material insidethe fuse, serves to choke out the arc and as the casing takes the placeof an external filling the construction is simpler and more readilymanufactured. It is also of advantage in connection with the apertures 9in the outer casing, as it is readily observed through the same, todetermine whether the fuse is .intact or whether it has been blown.

It will be understood that changes and modifications may be made withoutdeparting from the spirit of the invention.

What I claim is:

1. A fuse device comprising an exterior fuse-holding casing" made ofinsulating material and non-destructible by the operation of the fuse, afuse fitting within said casing and lining the interior wall thereof,end filling material on the inner side of said use.

2. A fuse device comprising an outside casing provided with aperturesand a hollow fuse arranged within said casing and lining the inner wallthereof, said fuse also having apertures, the apertures of said casingbeing put of register with the apertures in the use.

3. A fuse device comprising a tubular insulating casing, a tubular fuseconfined therein, said fuse having its ends longitudinally slotted andbent back over the ends of said insulating casing, and metal caps fittedover the ends of said insulating casing and the slotted ends of saidfuse.

4. A. fuse device comprising a tubular exterior casing made ofinsulating material having an aperture between its ends and a fuse ofsubstantially the same size as the interior of said casing, said fusefitting closely within said casing and lining the inner wall thereof.

5. The combination of an exterior hollow casing consisting of a tubularportion made of insulating material and metallic cap members fitted toand closing the ends of said tubular portion, and a tubular fusearranged within said tubular portion of said casing and lining theinterior Wall thereof, said fuse extending between and contacting at itsends with said metallic terminal caps, and said intermediate tubularportion being nondestructible by the explosion of the fuse.

6. The combination with an exterior casing of a hollow fuse arrangedwithin said casing and lining a wall portion thereof, said casing havingapertures in said wall portion through which said fuse may be seen.

7. A fuse device comprising in combination, an exterior casing having anaperture, a fuse arranged against the inner wall of said casing oppositethe aperture therein,

' and filling material on the other side of said fuse.

8. A fuse device comprising a tubular structure made of insulatingmaterial and provided with an aperture between its ends, metallicterminals at the ends of said tubular structure, and a tubular fuselining the interior wall surface of said tubular structure and connectedwith the metallic terminals thereon.

9. A fuse device comprising a tubular structure made of insulatingmaterial and provided with an aperture between its ends,

metallic terminals at the ends of said tubular structure, and a tubularfuse lining the interior wall surface of said tubular structure andconnected with the metallic terminals thereon, and'filling materialwithin said tubular fuse.

10. A fuse device comprising a tubular structure made of insulatingmaterial and provided with an aperture between its ends, metallicterminals at the ends of said tubular structure, and a tubular fuselining the interior wall surface of said tubular structure and connectedwith the metallic terminals thereon, said fuse being provided withapertures arranged out of register with the aperture in said tubularstructure.

11. The combination of a cylindric exterior casing made of insulatingmaterial and having an aperture between its ends, metallic terminalslocated at and closing the opposite ends of said casing, a hollowcylindric fuse of substantially the size of the interior of saidcylindric casing, said fuse being located within and lining the interiorwalls of said cylindric casing and being connected with said terminals.

12. The combination of a cylindric exterior casing made of insulatingmaterial and having an aperture between its ends, metallic terminalslocated at and closing the opposite ends of said casing, a hollowcylindric fuse of substantially the size of the interior of saidcylindric casing, said fuse being located within and lining the interiorwalls of said cylindric casing and being connected with said terminals,said connection between said fuse and terminals being formed by the endsof said fuse bent back over the outer surface of the ends of said casingbetween the same and said metal terminals, which latter are formed ascaps extending longitudinally over end portions of said casing.

13. A fuse device comprising a cylindric casing made of insulatingmaterial, provided with a plurality of apertures between its ends, ahollow cylindric fuse lining the inner wall of said casing, said fusebeing provided between its ends with apertures but having fuse materialregistering with one of said apertures in said casing, whereby said fusematerial ma be seen through said aperture before the use blows, endportions of said fuse being bent back over end portions of saidcylindric casing, and metallicterminal caps fitted over the turned backends of said fuse and covering the same, and also closing the ends ofsaid casing and fuse.

In witness whereof, I hereunto subscribe my name this 17th day ofFebruary, A. D., 1914.

EDMUND O. SCHWEITZER.

Witnesses:

A. L. JONES, H. A. J ONES.

